Typewriting machine



G. NAVARRIS.

TYPEWRITING MACHINE.

APPLICATION FILED MAR. 3 I92I.

L I-82m Patented 0st. 24, 1922'.

e O M LLHHIIHIIIIIIIIL%VIIIII I III Patented @ct. 24, i922. w

UNHTEEUD STATES GASTGN NAVARRE, Q1 lBULGNErSUR SE1Nfl FRANCE.

Application filed March 80, 1921. Seriallto. 456,977.

(GEABTILED UNDER THE PROVISIONS (015 THE ACT BF MARCH 3, 1921, 41 STAT. 5;,

To all whom it may concern:

Be it known that l GAs'roN Nev, a citizen of the French ltepublic, and a resi= dent of 23 rue Vauthier, Boulogne-sur-Seine, France, have invented new and useful Improvements Relating to 'lypewriting Machines (for which I have filed an application in France Mar. 29, 1919, Patent Number 509,609, Aug. 21; 1920), of which. the following is a specification.

My invention relates to typewriting ma of example one form of construction of theto the present HIVQDUOEIZ,

device accordin adapted to be tted to a type-writing maguns of the kind known as Underwood Fig. 1 is a plan view of the device.

Fig. 2 is a corresponding elevation thereof.

Figs. 3, 4c and 5 are detail views.

The alarm device for indicating the end of the page on typewriting machines comprises essentially a frame a, of shape and dimensions suited to the kind of type-writing machine upon which it is to be fitted. In the example described, the apparatus is fixed upon the machine by means of two screws, upon the left-hand side of the carriage.

Upon the framea there is-plaoed a wheel 6 graduated and notched, threaded upon an axle c and movable around the axle. A spiral spring located in the centre of the wheel 6, tends to return this wheel to its starting point. A tappet g fixed upon the graduated wheel I), abuts against the stop thus regulating the starting point of the wheel b.

Upon the axle 0 there is provided a needle or pointer d, movable around this axle, and adapted to be turned by means of a knob e. This pointer 01 engages its other extremity in any one of the notches in the graduated .e, fixed at one end to the rod n and at the wheel I), each notch corresponding to one of the lnterllne spaces of the type-writing ma-= chine upon which the apparatus is mounted. This end of the needle engaged in the notch pro ects slightly beyond the circumference of the graduated wheel 6, and is intended to act during the rotation of this wheel, upon the trip 74, tilting the hammer it which under the pull exerted by the spring j strikes sharply against the gong i producing the alarm sound.

Upon the frame a there is fitted a pawl m sliding in a guide-way and adapted to be engaged with or disengaged from the graduated wheel 6 by means of the knob Z. A rod n, sliding in the parts 7 and 8, comes into engagement at one end with one of the notches in the graduated wheel 6; the other extremity of this rod is bent back so that the line-spacing lever or any moving part of the type-wr ting machine comes into engagement with this member, imparting to it a forward movement which produces the rotaticn of the graduated wheel 6. A spring other end to the frame a, tends to return this rod to its initial position.

'lhe apparatus when fixed upon the type writing machine operates in manner:

After the paper has been engaged and gripped upon the roller of the type-writing machine, the buttonZ is operated to push the pawl m into engagement with one of the notches on the graduated wheel. By means of the knob e, the needle d is then turned so that its extremity engages in one of the notches of the graduated wheel corresponding to the number of lines which it is desired to typewrite. The apparatus is then ready to operate.

At each change of line, the line-spacing lever of the type-writing machine abuts against the cranked end of the slidin rod n thus producing movement of this re and therefore rotationof the wheel I) to the extent of one notch. This Wheel, after revolving one notch and displacing the pawl m is retained in the new position by this same pawl. i /hen the graduated wheel has thus revolved through the given number of notches,--in other words the number of lines typed, since each notch corresponds to one inter-line space-the end of the n.

the following bears against the trip It, thus tilting the hammer which strikes the gong 6, thereby warning the operator that he has reached the end of the number of lines which he had proposed to write.

By means of the knob Z, the pawl m is then withdrawn and the graduated wheel returns automatically to its starting position by the action of the spiral spring WVhen the tappet g strikes against the stop 9 the graduated wheel is held, and the apparatus is ready for another operation.

It will be understood that the apparatus can be arranged in indifferent ways, can be fitted in any manner upon any part of the type-writing machine; it may be integral with the frame or the carriage of the machine instead or" being fitted thereto.

The above described device offers the following advantages: it is of a great simplicity of construction, and all its members are within reach and within sight, which has for result a very easy adjustment according to the number of lines it is desired to be written.

What 1 claim is 1' In an adjustable alarm device for typewriting machines, of the type actuated through the line-spacing lever, the combination of a frame adapted to be secured to the carriage of the type-writing machine, a graduated ratchet wheel rotatably mounted hammer and actuated by the rotatable pointer to actuate the said hammer when the said pointer rotates in one direction, said trip permitting said pointer to pass by the same without actuatin said hammer when said pointer rotates in the other direction, a gong against which said hammer strikes, a spiral spring adapted to be wound up by .the rotation imparted to the ratchet wheel by the pawl member of the sliding rod and to automatically return the said wheel to its starting position, and a hand operated stop pawl carried by the frame and engaging the ratchet wheel.

In testimony whereof I have signed my name to this specification.

easron NAVARRE.

Witnesses:

C. URBURG, T. ARMENGOUD. 

